The U.S. Department of Energy closed a $5.1 billion loan package with Alliant Energy on October 28 to help finance natural gas-fired electricity generation, battery storage and grid upgrades in Iowa and Wisconsin. The agreements give Alliant’s regulated utilities access to lower-cost, long-term financing as electricity demand grows, particularly around new data centers. The loans are not grants, and individual projects must still meet eligibility and regulatory requirements.

Alliant Energy says the financing could support 1.6 gigawatts of new natural gas generation, another 240 megawatts of capacity at existing gas plants, one gigawatt of battery energy storage and two billion cubic feet of liquefied natural gas storage. The Department of Energy’s project summary instead specifies approximately 1.5 GW of new gas capacity. The difference reflects the figures published by the two parties; neither figure should be treated as completed, operating generation.

Natural gas generation alongside battery storage

Alliant’s Interstate Power and Light utility in Iowa can borrow up to $3.5 billion, while Wisconsin Power and Light has access to about $1.63 billion, under separate agreements. Funds can reimburse eligible costs, subject to qualifying projects and state approvals. The package covers new gas turbines, existing-plant enhancements, LNG fuel supply and battery systems rather than natural gas projects alone.

The company projects up to $1.2 billion in customer savings over 30 years through lower borrowing costs. That is a forecast, not savings already realized, and actual bills will also depend on construction costs, regulatory decisions, fuel prices and demand. DOE estimates the financing could support about 1,630 construction jobs and 46 permanent positions.

In July, Alliant’s management said contracted large-load customers could raise system electricity demand by roughly 60% by 2031. The company has been planning new dispatchable generation to serve expanding data-center campuses, including projects in Iowa and Wisconsin. Its strategy reflects a broader pressure explored in BitcoinVersus.Tech’s Iowa data center project coverage: generating capacity and dependable fuel supply must advance alongside computing demand.

The financed projects are not all approved

A federal loan closing lowers a financing hurdle but does not substitute for utility siting approval, environmental review or construction. The financing package also reflects a shift in federal energy lending: the original proposal was a smaller conditional loan in January 2025, before the program expanded to cover additional natural gas projects. Reuters reported that any consumer benefit may take years to materialize.

The next milestones will be individual project approvals, loan drawdowns and commissioning schedules. Until then, the advertised gigawatts describe a supported development portfolio, not power already delivered to the grid.

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